Simplifying of rules

*To*: mathgroup at smc.vnet.net*Subject*: [mg33742] Simplifying of rules*From*: "Eric L. Strobel" <fyzycyst at comcast.net>*Date*: Wed, 10 Apr 2002 00:50:08 -0400 (EDT)*Reply-to*: fyzycyst at mailaps.org*Sender*: owner-wri-mathgroup at wolfram.com

I got the following solution to a complicated set of trig equations (using the following statement: soln2 = Solve[{eq6, eq7}, a] where the equations involve trig functions of a, b and a+b ... {{a -> -ArcCos[-Cos[b]]}, {a -> ArcCos[-Cos[b]]}, {a -> -ArcCos[Cos[b]]}, {a -> ArcCos[Cos[b]]}} Now, by inspection it's obvious what the relationship between a & b is, but how do I force Mathematica to simplify out all these ArcCos[Cos[]] instances? I guess the other question would be "How could I have avoided these nonsimplified rules to begin with?" - Eric. -- Eric Strobel (fyzycyst at NOSPAM^mailaps.org) ===================================================================== I'm always forgetting that I have short term memory loss... =====================================================================